回火硬度对4Cr5Mo2V钢抗铝液熔损性能的影响  

Effect of Tempering Hardness on Erosion Resistance of 4Cr5Mo2V Steel in Molten Aluminum

作　　者：楼通海 左鹏鹏[1,2,3] 吴晓春(导师) LOU Tonghai;ZUO Pengpeng;WU Xiaochun(School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China;State Key Laboratory of Advanced Special Steel,Shanghai University,Shanghai 200072,China;Shangda Xinlun Material and Technology(Guangdong)Co.,Ltd.,Zhaoqing 526105,China)

机构地区：[1]上海大学材料科学与工程学院,上海200072 [2]上海大学省部共建高品质特殊钢冶金与制备国家重点实验室,上海200072 [3]上大鑫仑材料科技(广东)有限公司,肇庆526105

出　　处：《机械工程材料》2023年第3期48-54,共7页Materials For Mechanical Engineering

基　　金：广东省重点领域研发计划项目(2020B010184002);省部共建高品质特殊钢冶金与制备国家重点实验室自主课题项目(SKLASS2020-Z08)。

摘　　要：通过淬火和不同工艺的回火热处理得到不同回火硬度(41.2,45.0,49.3 HRC)的4Cr5Mo2V钢,采用试样在熔融铝合金中动态旋转的方法研究了回火硬度对该钢抗铝液熔损性能的影响。结果表明:随着回火硬度的升高,在相同熔损时间内试验钢的熔损质量损失降低;随着熔损时间的延长,试验钢迎铝面先形成细密点蚀坑,随后出现局部剥落以及局部严重腐蚀,最后发生全面腐蚀;界面层的金属间化合物由内层致密的η-Fe_(2)Al_(5)相和外层疏松多孔的αH-Fe_(2)Al_(8)Si相组成;随着回火硬度的升高,背铝面界面层内层厚度增大,外层占比降低,基体中固溶铬元素增多,试验钢的抗铝液熔损性能提高。4Cr5Mo2V steel with different hardness(41.2,45.0,49.3 HRC)was obtained by quenching and different tempering heat treatment processes.The effect of tempering hardness on the erosion resistance of the steel in molten aluminum was studied by making the samples rotate dynamically in the molten aluminum alloy.The results show that with increasing tempering hardness,the erosion mass loss of the test steel for the same erosion time decreased.With the extension of erosion time,fine pitting pits appeared on the face-aluminum surface of the test steel first,and then partly peeling and partly severe corrosion appeared,and finally comprehensive corrosion occurred.The intermetallic compound of the interface layer consisted of a denseη-Fe_(2)Al_(5) phase inner layer and a porousαH-Fe_(2)Al_(8)Si phase outer layer.With increasing tempering hardness,the thickness of the inner layer of backaluminum surface increased gradually,and the proportion of the outer layer decreased gradually,the chromium content in the matrix increased,resulting in the improvement of erosion resistance of the test steel in the molten aluminum alloy.

关 键 词：热作模具钢 回火硬度 铝合金液 抗熔损性能 金属间化合物 

分 类 号：TG142[一般工业技术—材料科学与工程]